Electric-arc lamp.



A. BLONDEL 6: G. DOBKEVITGH.

ELECTRIC ARG LAMP. .APPLICATION FILED PEBJ, 1905.

Patented Mar. 5, 1912.

3 SHEETS-SHEET 2.

Witnesses l Inventors ndre Blondel, Gatan D bkevitch ,1w v

Their` fltto'rne.

A. BLONDEL & G. DUBKLVITCH.'

.ELECTRIC ARG LAMP.

APPLICATION IILBD Imm, 1905 PaeLtenteg-` Maf. 5, 19.12. I

s SHEETS-SHEET a..

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f i n l I I i s ff s r i a@ 25 \r y v t xNvENToRs.' ANNDRE BLONDEL, GAETAN DOBKEVVTCH.

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' ANDR| BLONDEL AND GATAN DoBKEvITcH, 0F PARIS, `FRANGE, .AssIGNona BY MEsNE ASSIGNMENTS, To GENERAL ELECTRIC COMPANY, A CORPORATION oF NEW YORK.

, ELEcTnIc-Aae LAMP.

Speveilloation of Letters Patent.

rratentea Mar. 5, 1912.'

. -Zo all whom 'it may concern:

Be it known that we, 'ANDR BLONDEL, a citizen of the Republic of France, and GA- TAN DoBKEvITcH, a subject' of the Emperor.

of Russia,residing at Paris, France', have in vented new and useful Improvements 1n Edectric-Arc Lamps; and we do hereby -deand object being to avoid the loss of voltage caused by the use of mineralized electrodes by reason of high resistance and. large length thereof; This-Objectis attained by means of improved. simple and economical devices arranged 'to "bring the current tothe electrodes near the points thereof and without hinderingzby undue fricticn the 'operation 'of the. usual .regulating mechanism,

` parts, fully described vandclaimed hereinso that the current is not'oblig'ed to pass; through the entire length of the electrodes, where nearl, all. lo'ss ofvv voltage is avoide said evices beingr combined'with suitable means protecting the same a ainst thedfumes produced by the mineralize electro es.

The invention consists Aofthe construe.v

tion, combination and '-,arra-ngement of after. l

'In order to it'acilitatel the comprehension of our present invention, we have shown several forms of embodiments thereof in the accompanying drawin s, wherein y Figure 1 shows a Si e elevation of the upl per carbon of an electric arc-lamp provided l l 'rent closeto theV point thereof.4

with an improved friction shoe brin -'ng the current. close to the pointthereof. ig. 2 iS a plan view. of same. Fig. 3 shows another form offrietion-'shoe Fig. 4 is' the plan view of this-arrangement. Fig. 5 shows a modification of the 'arrangement shown in- Figs'. 4 and 3. 6 shows the lower carbon of anarc-lamp provided-with my improved friotionysho'es for bringinBg the curig, 7 is a plan view of same. y Fig' 8 shows a modified lower carbon.

arrangenuentI of' the friction shoe for the Fig. 9 is a horizontal sectional view of same. Fig. 10 shows the front elevation vofan arc-lamp embodying "inclined lelectrodes provided with our improved friction-shoes. Fig. 11 is a side'elevation of same.

" wat Like numerals refeg; to like parts throughi out allthe views.

Referring to the drawings and more partlcularly to F 1 and 2, l 'represents the upper carbon-holder suspended 4by means of' chain or rod 2; 3 is thev carbon carried by said holder and passing Afreely through an opening in the horizontal protecting plate 4:,

att-ached in. any Suitable/Wario .the lamp-f frame and under which' theelectric arcis prpducpd; A', lhe lower. portion :off the carbon 3 1s friction'ally engaged by aconcave shoe 5, the 'concavity of which corresponds to the convexity of the carbon. The friction-shoe -5 or contact piece is'pivotally arranged on a .hori'zontahpin 6 carried by a yoke 7 made -ln-tegral with a vertical redA 8' pivotally arranged at its -uptpker end Von a horizontal pin 9, attached to Arranged at the lowerend of the vertical rod 8 is-a balance-weight 1 0, intended to slightly press the friction shoe 5 a ainst the. carbon 3. ByA this arrangement t e rod 8,- aots like apendulous lever'and'the friction "contact shoe is freeto turn. independently.

oi" the lever in the planeof the' swing'of said .,lever, and thereby to'adapt itself tomvake vgoodcontact Awith the electrode irrespective of irregularities of the surfac'eof thelatten .'Theweiight- IO-m'ay heassisted 'byone o r more eo edisprings 1 1, one end'of whichl is Vattached. tn ais'u-itable bracket -12 secured on 'the protecting plate 4, while the opposite end of said spring 'or springs is attached to the pivotalin The electric current is vbrought tolte shoe by means 'of a cone top of the lamp-frame'.-

ducting l wire-13. c.' Thepressure of the vfri'ction shoeuponthe-carbon, causes the latten to enga-ge Athe oppositefedg'e of the openingl in the protectingplatej, sothat'current 1s supplied to. ,the carbon .both through the friction shoe 5 or Contact piece andthe procontact piece 5 and the protecting tecting plate 4. The pivotal arrangement of the friction shoe' prevents the carbon from being wedged. As shown in Fig. 1, the friction-shoe 5 is beveled at its upper end for the purpose of clearing the passage for the carbon holder 1, whereby nearly the entire length of carbon may be utilized;

In the construction shown in Figs. 3 and 4, the contact piece 5, instead of being of a .concave form, is made with a convex con tacting` surface and secured to the lower .end of two double-armed levers 7, pivoted I carbon-holder l, sol that the latter may be` lowered freely until it comes into contact with the protecting plate 4.

In the modied construction shown in Fig. @the contact piece 5, engages a suitable recess' provided in the economizer 15.

The arrangements so far described are intended tobring the, electric current to the upper carbonv of the lamp. We will now proceed to describe similar arrangements for the lower carbon of the lamp.

Referring tol Figs. 6 and `7, 16 indicates the vertical '-rod which supports the lower carbonfholder 17 through vthe medium of a swivel-joint 18. Said rod 16 yis telescoped a. hollow rod 19 to which isattached the protecting plate 20 already described. Se- ,c'uredtto the `rod 194 is a horizontalarm 21 carrying a. concave friction-shoe Yor contact piece 22 in engagement with the carbon 23' andv cutfaway obliquely as shown, for'the` purpose'of-acilitating the'dropping of cinder produced -bythe are. The opposit-eside 'of the carbon 23 is engaged by another con-v A tact piece ,24,.pivotally arranged ona horrzontal pin 25, carried by two linl: arms 26, 26 pivotally arranged on a horizontal pin 27, carried by said arm 21.; The link#v arms `26.are suicienxtly set apart to-clear the .passage for the lower carbon and carbonholder. The pivoted contact piece 24 is pulled against the carbon 23 by its"A own weightand by means of one or more springs 27 as show-n, or any suitable weight. Current is supplied in any suitable way t0 the arm 21 and the pivoted contact piece 24, so

that thecurrent is brought to the-carbon.

23 near the end thereof.

In the modification shown in Figs. 8 and 9,*the arm 21 forms a cross-'bar connecting two rods 19"and provided with a central n Icylindrical hole 22 forA the passage of the carbon 23. The contact-piece 24 is pivotally arranged on the lower ends of bell crank levers 29, pivoted on studs 30 secured to the arm 2l and provided With'a wcightll. The latter may be assistedV by springs 32 to hold the contact piece 24 in engagement with the carbon 23. The current is supplied to the end of the latter through the arm 21 and the contact piece 24, electrically connected by means of a wire` 28. 1() and l1 show an arc-lamp embodying inclined mineralized electrodes, provided with our improvements. The inclined carbons 3, 3 are frictionally engaged at their lower ends above the economizer 15 and protecting plate 4 by friction-shoes or contact pieces 5, pivotally arranged on the lower end of arms 8, pivoted at 9, 9 on the top of the lamp. y

It will be understood that many modifications and changes may be made in the minor details 'of construction and relative arrangement of the parte, without departing from the scope ofthe invention.

Having fully 'described our invention, what we claim and desire to secure by Letters Patent is i l1. In an electric arc lamp, in combinationv witheach electrode of a xed guide for the sa1nea lever yieldingly biased toward con tact with the electrode'near its arcing end, a friction contact shoe mounted at the free end of the lever for contact with the electrode and holding it against the fixed guide.

Yand flexible conductors in the lamp `circuit connected with the contact shoes and guides,- whereby the 'arc maintaining Y current is passed through a limited portion only of the electrodes. i

2. In an electric arc lamp, in combinat-ionr-wit-h each electrode of a lever yieldingly biased toward contact with the electrode near its arcing end, a friction contact shoe pivoted to the free end ofthe lever for in'dependert movement in the'plane of the swing of the lever, whereby its contacteur face adapts itself to the surface of the elec. t-rode, and, flexible conductors in the lamp circuitconnected with the contact shoes.

3..In -an electric arc lamp, in combination with each electrodeof a fixed guide for the same, a lever yieldingly biased toward contact with the electrode, a pivoted fr iction contact shoe carried at the` free end of the lever and bearing upon the electrode near its arcing e'nd and thereby holding it against the-'fixed guide, `and means for conveying the varc maintaining current Vbetween the contact shoes and the electrodes.

4. In an electric arc lamp, the combina,

tion with each electrode ofla' lever'yieldingly biased .toward contact lwith the elec# trode n'ear its arcing end, a friction contact lill! shoe pvoted to the free end of the levernan-les to this specification in the presence formed With a Contact surface matching the of two subscribing Witnesses.

surface ofA the electrode and a exble conductor in the lamp creut connected with ANPR BLONDEL' T n 5 the Contact shoe,` whereby the are Inaintan- GAETAN DOBKEVI CH ing current is passed through a limited por- Witnesses:

tion only of the electrodes.v JOSEPH FLANVIN,

In testimony whereof, we have signed our J OSPHINE CORNET. 

